| Abbreviation | Definition |
|---|---|
| INFC | Indian Nations Football Conference |
| IRFU | Irish Rugby Football Union |
| ISFA | Independent Schools Football Association |
| ITFC | Ipswich Town Football Club |
| ITFL | Internet Tecmo Football League |
| IUFT | International Ukrainian Football Tournament |
| JAFA | Japan Australian Football Association |
| JBFA | Japan Blind Football Association |
| JFA | Japan Football Association |
| JFC | Jaipur Football Club |
| JFDB | Japan Football Data Bank |
| JFF | Jamaica Football Federation |
| JFF | Johnny F***ing Football |
| JFF | Johnny Fightin Football |
| JFL | Japan Football League |
| JFL | Junior Football League |
| JFRA | Jamaica Football Referees Association |
| JLFC | Jimmye Laycock Football Center |
| JPP | Jean-Pierre Papin |
| JRFU | Japan Rugby Football Union |